JPH0342546A - Redundant device for sampling system - Google Patents

Abstract

PURPOSE:To facilitate maintenance and inspection of a sampling system and to improve the reliability by providing plural redundant pipes having pumps and check valves. CONSTITUTION:A pump 7a is operated to lead a fluid to be measured in a pipe 1 into a sampling pipe 2, and radiation in the fluid is detected by a radiation detector 5. At this time, check valves 10a and 11a are in the same direction as flow of the fluid, and the fluid is returned to the pipe 1 through a redundant pipe 6a. At this time, a pump 7b is stopped, and the fluid which tries to flow back to a redundant pipe 6b through the pipe 6a is stopped by check valves 10b and 11b. If the pump 7a is stopped by some cause, the pump 7b is immediately operated, and check valves 10b and 11b are in the same direction as flow of the fluid and check valves 10a and 11a are in the direction opposite to flow of the fluid, and the fluid passes the pipe 6b. Thus, solenoid valves to be controlled are unnecessary to facilitate maintenance and inspection.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a redundant device for a sampling system used, for example, when detecting radiation in a nuclear power plant.

[Conventional technology]

FIG. 2 is a sampling piping system diagram showing a redundant device of a conventional sampling system.

In the figure, (1) is the pipe through which the fluid to be measured flows, (
2> is a sampling pipe provided to draw in the fluid to be measured in the pipe (1) as a sample, (3) is a filter,
(4) is a flowmeter, (5) is a radiation detection zone, (6a), (
6b) is a redundant pipe (7a) which is a branch of the sampling pipe (2).

(7b) is a pump installed in redundant piping (6a) and (6b), respectively, to draw the fluid to be measured into sampling piping (2); (8a) and (8b) are pumps (7a);
Inlet side solenoid valve N provided on the inlet side of (7b)
(9a).

(9b) is an outlet side solenoid valve provided on the outlet side of the pumps (7a) and (7b), respectively.

Next, the operation will be explained.

The fluid to be measured in the pipe (1) is drawn into the sampling pipe (2) by operating the pump (7a) or pump (7b), and is subjected to radiation through the filter (3> and flow meter (4)). The radiation in the fluid to be measured is detected by the radiation detector (5).

Here, if the pump (7a) is in operation and the pump (7b) is stopped, the inlet side solenoid valve (8a) and the outlet side solenoid valve (9a) are open, and the inlet side solenoid valve (8b) and the outlet side solenoid valve (8a) are open. Since the electromagnetic valve (9b) is set to close, the fluid to be measured via the radiation detector (5) is returned to the pipe <1> through the redundant pipe (6a). Now, suppose that the pump (7a) has stopped due to some reason (pump failure, etc.), the solenoid valves (8a) and (9a) are closed, and the solenoid valves (8b) and (9a) are closed.
b) is opened and the pump (7b) is operated. In this way, it is possible to always draw the fluid to be measured into the sampling pipe (2).

[Problem to be solved by the invention]

Because the redundant equipment in conventional sampling systems is configured as described above, it is necessary to control the opening and closing of the solenoid valves in accordance with pump operation, and maintenance and inspection of the solenoid valves are also required. There was an issue.

This invention was made to solve the above-mentioned problems, and by eliminating the solenoid valve that requires control, it is possible to obtain a redundant device for a sampling system that is easy to maintain and inspect, is highly reliable, and is inexpensive. With the goal.

[Means to solve the problem]

A redundant device for a sampling system according to the present invention includes a plurality of redundant pipes provided in parallel in the middle of a sampling pipe,
Pumps are provided on each of these redundant pipes to draw fluid into the sampling pipe, and a check valve is provided on at least the outlet side of each of these pumps.

[For production]

In the sampling system redundancy device of the present invention, check valves are provided on the outlet sides of the pumps provided in each of the plurality of redundant pipes in the middle of the sampling pipe. , prevents fluid that has passed through a pump in operation from flowing into a pump that is stopped and flowing back into the redundant piping.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

In Figure 1, (1) is a pipe through which the fluid to be measured flows, (2) is a sampling pipe provided to draw in the fluid to be measured in pipe (1) as a sample, (3) is a filter, ( 4) is a flowmeter, (5) is a radiation detector, (6a)
.

(6b) is a redundant pipe provided in parallel in the middle of the sampling pipe (2), and (7a) and (7b) are redundant pipes (6a) for drawing the fluid to be measured into the sampling pipe (2).

Pumps provided in (6b), (10a) and (
fob) is an inlet side check valve provided on the inlet side of the pump (7a) and (7b), respectively, and (lla) and (llb) are the pump (7a).

(7b) are outlet side check valves provided on the outlet side respectively.

In the sampling system redundancy device configured as described above, similarly to the conventional device described above, by operating either the pump (7a) or the pump (7b), the sample to be measured in the pipe (1) is The fluid is in the sampling piping (
2), and the radiation in the fluid to be measured is detected by the radiation detector (5).

Assuming that the pump (7a) is currently in operation, the check valve (
10a) and (lla) are in the forward direction of the fluid flow, and the fluid flows smoothly through the redundant piping (6a) to the piping (1).
) is returned. On the other hand, since the pump (7b) is stopped, the fluid that has passed through the redundant piping (6a) attempts to flow back into the redundant piping (6b) from the outlet side of the pump (7b) due to the operation of the pump (7a). Stop valve (xob), (11b
) prevents backflow of fluid.

Here, if the pump (7a) stops for some reason, the pump (7b) is immediately operated, but in this case, the check valves (10b) and (llb) are in the forward direction of the fluid flow. Therefore, the check valves (10a) and (lxa) are in the opposite direction to the fluid flow, and the fluid passes through the redundant piping (6b).

In addition, in the above embodiment, the pumps (7a) and (7b)
In the above description, check valves are provided on the inlet and outlet sides of the pumps (7a) and (7b), but the check valves (LOA) and (10b) on the inlet sides of the pumps (7a) and (7b) may not be provided.

Further, in the above embodiment, a redundant device using two pumps has been described, but any device that uses three or more pumps and has a plurality of redundant piping can provide the same effects as the above embodiment.

〔Effect of the invention〕

As described above, according to the present invention, the redundant device of the sampling system is configured such that a check valve is provided at least on the outlet side of each pump provided in a plurality of redundant pipes, so maintenance and inspection are easy and reliable. This has the effect of providing high performance and low cost.

[Brief explanation of drawings]

FIG. 1 is a piping system diagram showing a redundant device for a sampling system according to an embodiment of the present invention, and FIG. 2 is a piping system diagram showing a conventional redundant device for a sampling system. In the figure, (2> is a sampling pipe, (5) is a radiation detector, (6a), (6b) is a redundant pipe, (7a),
(7b) is a pump, (10a) and (10b) are inlet side reverse ratio valves, and (lla). (llb) is an outlet side check valve. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] A plurality of redundant pipes are provided in parallel in the middle of the sampling pipe, a pump is provided for each of these redundant pipes to draw fluid into the sampling pipe, and a check valve is provided at least on the outlet side of each of these pumps. redundant equipment for the sampling system.